Study On Dynamic Simulation And Optimization Of OXO Process

Process simulation technology can be used in the development of process design,optimization of operation and all aspects.Dynamic simulation could show real-time and prediction of performance of chemical plants,and will play an increasingly important Part in process design and production operation.This Paper deals with the dynamic simulation of the LP OXO process,and focuses on the optimization of aldol condensation section and 2-EH refining section.For the dynamic simulation of the whole process,physical properties database is established.Unit module is used sequentially to from a dynamic simulation system according to the practical plant.The steady-state results of the dynamic simulation system and those of the designed are in good agreement.The tolerance of the important Parameters is less than 4%,and the accuracy of the dynamic simulation is proved.In this study,NRTL equation is used to describe the non-ideal behavior of the liquid phase in biphasic aldol condensation environment.The reaction mechanism of the aldol condensation reaction is analyzed to establish the reaction network mathe matical model of aldol condensation to complete the model of aldolisation reactor.The effect of the operating temperature of aldolisation reactor and the concentration of alkali in the cyclic aqueous phase on the selectivity and conversion of n-BAL is investigated.The aldolisation reaction temperature is set at 125 ℃,and the alkali concentration in aqueous phase is 0.3 mol%,selectivity and conversion of n-BAL will increase.In this Paper,the 2-EH refining section is systematically analyzed.For the forecolumn,the effect of the top pressure and reflux ratio on the seParation is analyzed.The appropriate top pressure of the forecolumn should be increased by 2-3 kPa,which can significantly reduce the fraction of 2-EH at the overhead and the load of vacuum system.